Shangwei

HR 2209 · HIP 29997

👁️ Naked-eye

📋 A written introduction is coming — for now this page shows official values only.

Star

Apparent magnitude: 4.757 mag
Parallax: 18.64 mas → about 175 light-years away
Spectral type: A0Vn
Right ascension: 94.7116°
Declination: 69.3198°
Designation: HR 2209
HIP number: 29997
IAU name adopted: 2025-12-25
Name language: Chinese
Name origin (IAU): Shàng Wèi (The Great Imperial Guard, 上衛) is the name of the fifth star on the right wall and the sixth star on the left wall of the Zǐ Gōng (Purple Palace, 紫宮) / Zǐwēi Yuán (Purple Forbidden Enclosure, 紫微垣), counting northward from the southern gate. Its corresponding star has changed many times throughout history.

Constellation

Light from this object takes about 175 years to reach Earth — the light you see tonight left around AD 1851 (official distance ÷ speed of light).
At magnitude 4.8 it is bright enough for the naked eye (limit about 6) — look from somewhere dark.
Declination 69.3° — from Seoul (37.6° N) it never sets and circles the northern sky all night.

Worked out from this object's official values.